powerpc: wii.dts: Expose HW_SRNPROT on this platform

This Hollywood register isn’t properly understood, but can allow or
reject access to the SRAM, which we need to set for RTC usage if it
isn’t previously set correctly beforehand.

See https://wiibrew.org/wiki/Hardware/Hollywood_Registers#HW_SRNPROT

Signed-off-by: Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211215175501.6761-4-linkmauve@linkmauve.fr

diff --git a/arch/powerpc/boot/dts/wii.dts b/arch/powerpc/boot/dts/wii.dts
index e9c945b123c60822a88d623f0d0700e5f73e9b63..e46143c32308828b06c220239eee2f6d1fc049b7 100644 (file)
--- a/arch/powerpc/boot/dts/wii.dts
+++ b/arch/powerpc/boot/dts/wii.dts
@@ -168,6 +168,11 @@
                        interrupts = <14>;
                };
 
+               srnprot@d800060 {
+                       compatible = "nintendo,hollywood-srnprot";
+                       reg = <0x0d800060 0x4>;
+               };
+
                GPIO: gpio@d8000c0 {
                        #gpio-cells = <2>;
                        compatible = "nintendo,hollywood-gpio";